CVE-2021-25830

PoC —

CVSS 3.1

9.8 critical

EPSS

12%p96

Published

Mar 1, 2021 (Mar 1, 2021)

Modified

Jun 17, 2026

Description

A file extension handling issue was found in [core] module of ONLYOFFICE DocumentServer v4.2.0.236-v5.6.4.13. An attacker must request the conversion of the crafted file from DOCT into DOCX format. Using the chain of two other bugs related to improper string handling, an attacker can achieve remote code execution on DocumentServer.

Vendors: onlyoffice
Products: document server
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD CVE.org GitHub PoCs EPSS (11.8%)

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